Range of multi-couplings for sequential injection developed

Stäubli, specialists in quick release connections, says it is continuing to develop its range of multi couplings designed for advances in the injection moulding industry that require a sequential injection process, ensuring that each segment of the mould is supplied with material at the required flow rate and temperature.

The SPC multi-couplings are said to have been developed specifically to address the need for quick and accurate changes of sequential valve gate connections.

Stäubli says connecting the hydraulic circuits during mould changeovers can take up to 20 minutes when individual couplings are used, even longer if threaded connections are involved, but this time is reduced to less than one minute with the SPC multi-couplings, where up to eight inlets and eight outlets can be positioned on one SPC multi-coupling plate.

Connection accuracy is said to be guaranteed; with connection only possible in one position, eliminating any possibility of a wrong or cross connection. Additional safety options include a keying system preventing any connection errors where several plates are used with the same mould tool.

Stäubli says the efficient and robust locking system is quickly activated by simple rotation of the removable control lever and the optional proximity switch ensures safe working practices are maintained by providing a signal to give direct indication that the plates are securely together. A parking plate is said to provide the additional benefit of protecting the machine side plate during a tool change and improving safety by retaining loose hoses.

Each SPC connector is of flush face, non-spill design, said to improve safety by preventing any spillage of fluid that could lead to hazardous slippery floors and preventing the cost involved in replacing and cleaning up any spilt fluid. The connector design is also said to ensure no ingress of contaminants into the circuits that could affect the performance of the system and increase the need for maintenance. Space is normally at a premium on mould surfaces so Stäubli says the small footprint permits flexibility in mounting the tool side plate on any available location on the mould.

Stäubli’s sequential injection multi-couplings, SPC 203 and SPC 205 are designed for flow rates up to 2.85l/mn and up to 8l/mn respectively. They control the centralised supply of hydraulics to the valve gate cylinders and operation of the sequential injection nozzles of the injection moulding machine.

There are several options available on each model depending on the number of circuits to be supplied; two, four, six or eight, the plate fixed to the mould will have the corresponding four, eight, twelve or sixteen plugs.